package cn.tedu.v2_3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;


public class Server {
    private ServerSocket serverSocket;
    public Server() {
        try {
            serverSocket=new ServerSocket(4545);
        } catch (BindException e){
            System.out.println("端口号重复申请，建议换个端口号----");
    } catch (IOException e) {
         System.out.println("申请端口号失败----");
    }
    }

    public void star() {


        try {
            while(true) {

            System.out.println("————等待客户端连接——————");
           Socket socket= serverSocket.accept();

           String ip= socket.getInetAddress().getHostAddress();
            System.out.println(ip+"客户端连接成功");
                new Thread(new CS(socket)).start();
           }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开");
        } finally {

            if (serverSocket!=null&&serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败");
                }
            }

        }


    }
    public static void main(String[] args) {

        new Server().star();

    }

    private class CS implements Runnable{

        private Socket socket;

        private String ip;

        public CS(Socket s){

            this.socket=s;

            ip=socket.getInetAddress().getHostAddress();
        }

        public void run() {
    //  BufferedReader br=null;
            PrintWriter pw=null;
            try {
                   //读入定义：
         BufferedReader br=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF8"));
            //定义写出：
                pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
                new Thread(()->{

                    try {
                        String message;
                        while ((message=br.readLine())!=null){
                            System.out.println("客户端说："+message);
                            System.out.println("--------------------------");
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器端请输入：");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败!");
                    }
                }).start();
                //2.1提供写的方法：控制台输入的功能
                Scanner input=new Scanner(System.in);//后台卡住


            while(true){
                System.out.println("服务器端请输入：");
              String line=  input.nextLine();//得到控制台输入值
              //打印：服务器端说的文本---打印客户端
                pw.println("服务端说："+line);

            }
            }catch(NullPointerException e){
                System.out.println("IO流传入对象，" +
                        "有对象为null，立马核对，" +
                        "查看try块种对象可能赋值为null");

            }catch(UnsupportedEncodingException e){
                System.out.println("客户端或服务器端：字符集不一致哦");
            }
            catch (IOException e) {
                System.out.println("通讯过程中，传输出现错误！");
            }catch(Exception e){
                e.printStackTrace();
            } finally {

//
//                if (br!=null){
//                    try {
//                        br.close();
//                    } catch (IOException e) {
//                        System.out.println("结束通讯，关闭失败");
//                    }
//                }
                if (socket!=null&&socket.isClosed()){
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println("通讯关闭失败~");
                    }
                }
            }

        }

    }

}
